Even if the legend makes people think that Charles Manson was a Beatles fan, he wasn't. He knew their music but as he declared in Kalx Interview: "That was... you see, you people gotta realize, man, I’m fifty years old. Bing Crosby was my heartthrob. Frank Sinatra was my hero. Not the Beatles." We can also find a very similar statement in 1989 Geraldo Rivera Interview: " I wasn’t a generation of the 60’s. I’m a Bing Crosby fan, not a Beatles fan. You guys make me into be something that I wasn’t. I never had a beard or long hair in my life. I was a beatnik not a hippie".
Other music influences mentioned by Charlie in his songs are Hank Williams (aka Luke the Drifter), Lefty Frizzel and Woodie Guthrie. And Elvis Presley? Here's an excerpt from Seconds Magazine where Manson expresses his thoughts: "I lived in Elvis Presley’s house. He ran me out of the yard. I got mad at him, I was going to throw some rocks at him because I thought he was a fucking idiot and an egotistical punk. I never liked him even a little bit, but everybody else kow-towed to him because he was rich. But to me that don’t mean shit. I don’t give a fuck how rich you are, I’ll bust you up anyway".

It's possible to hear Manson mentioning Hank Williams in many songs like inCommemoration's A Tribute to Hank Williams or The Summer of Hate's Twilight Blues.
Down here you can listen to Dream Train/My Oklahoma Angel Love, a song from the album The way of the Wolf where Manson talks about his music memories mentioning Woodie Guthrie, Hank Williams, Lefty Frizzel and Elvis Presley.